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In this lesson we will concentrate on OSPF Standard Area and OSPF Backbone Area. We will do a Multi Area OSPF Configuration With Backbone Area and OSPF Standard Areas. In other lesson, we will also give example for the other OSPF Area Types and their configuration examples on Packet Tracer.
You can DOWNLOAD the Cisco Packet Tracer example with .pkt format at the end of this lesson.
As you know from the previous lessons, OSPF has 6 different areas. These areas are:
You can check the below lessons for the configuration of different OSPF Area Types:
In this first post, we will focus on Backbone Area and Standard (Normal) Area. Beside this, we will see the configuration of virtual-link on OSPF. What was the virtual-link? It was the link that used to connect the normal areas to the backbone area, if they are not connected directly to the backbone area. Remember, in OSPF, there was a rule. All areas must be connected to the backbone area, Area 0. If they are not, they can temporarily connect to the backbone via virtual-links.
You can also check Basic OSPF Confiuration
Normal Areas accept the Summary LSAs from other Areas (Type 3 and Type 4 LSAs). They accept also the External LSAs (Type 5 LSAs). Type 1 and Type 2 LSA are already accepted inside area.
We talked about theorical too much. This post aims to show you the configuration of this areas and as you know, doing the configuration is the most effective way of learning network protocols.
Our topology will be like below fort he first example.
Firstly let’s configure the IP Addresses on all routers:
Router1
Router1>enable Router1# configure terminal Router1(config)# interface GigabitEthernet0/0 Router1(config-if)# ip address 10.1.0.1 255.255.255.0 Router1(config-if)# no shutdown Router1(config-if)# exit Router1(config)# interface GigabitEthernet0/1 Router1(config-if)# ip address 10.2.0.1 255.255.255.0 Router1(config-if)# no shutdown Router1(config-if)# end Router1# copy running-config startup-config
Router2
Router2>enable Router2# configure terminal Router2(config)# interface GigabitEthernet0/0 Router2(config-if)# ip address 10.1.0.2 255.255.255.0 Router2(config-if)# no shutdown Router2(config-if)# exit Router2(config)# interface GigabitEthernet0/1 Router2(config-if)# ip address 10.3.0.1 255.255.255.0 Router2(config-if)# no shutdown Router2(config-if)# end Router2# copy running-config startup-config
Router3
Router3>enable Router3# configure terminal Router3(config)# interface GigabitEthernet0/0 Router3(config-if)# ip address 10.2.0.2 255.255.255.0 Router3(config-if)# no shutdown Router3(config-if)# exit Router3# copy running-config startup-config
Router4
Router4>enable Router4# configure terminal Router4(config)# interface GigabitEthernet0/0 Router4(config-if)# ip address 10.4.0.1 255.255.255.0 Router4(config-if)# no shutdown Router4(config-if)# exit Router4(config)# interface GigabitEthernet0/1 Router4(config-if)# ip address 10.3.0.2 255.255.255.0 Router4(config-if)# no shutdown Router4(config-if)# end Router4# copy running-config startup-config
Router5
Router5>enable Router5# configure terminal Router5(config)# interface GigabitEthernet0/0 Router5(config-if)# ip address 10.4.0.2 255.255.255.0 Router5(config-if)# no shutdown Router5(config-if)# exit Router5(config)# interface GigabitEthernet0/1 Router5(config-if)# ip address 10.5.0.1 255.255.255.0 Router5(config-if)# no shutdown Router5(config-if)# end Router5# copy running-config startup-config
Router6
Router6>enable Router6# configure terminal Router6(config)# interface GigabitEthernet0/1 Router6(config-if)# ip address 10.5.0.2 255.255.255.0 Router6(config-if)# no shutdown Router6(config-if)# end Router6# copy running-config startup-config
After this basic interface configurations, let’s configure the OSPF on all routers. Here, OSPF process number will be 1 and the Routerx’s router ID will be x.x.x.x. Beside this, all the connected areas will be configured.
Router1
Router1>enable Router1# configure terminal Router1(config)# router ospf 1 Router1(config-router)# router-id 1.1.1.1 Router1(config-router)# network 10.1.0.0 0.0.0.255 area 0 Router1(config-router)# network 10.2.0.0 0.0.0.255 area 1 Router1(config-router)# end Router1# copy running-config startup-config
Router2
Router2>enable Router2# configure terminal Router2(config)# router ospf 1 Router2(config-router)# router-id 2.2.2.2 Router2(config-router)# network 10.1.0.0 0.0.0.255 area 0 Router2(config-router)# network 10.3.0.0 0.0.0.255 area 2 Router2(config-router)# end Router2# copy running-config startup-config
Router3
Router3>enable Router3# configure terminal Router3(config)# router ospf 1 Router3(config-router)# router-id 3.3.3.3 Router3(config-router)# network 10.2.0.0 0.0.0.255 area 1 Router3(config-router)# end Router3# copy running-config startup-config
Router4
Router4>enable Router4# configure terminal Router4(config)# router ospf 1 Router4(config-router)# router-id 4.4.4.4 Router4(config-router)# network 10.3.0.0 0.0.0.255 area 2 Router4(config-router)# network 10.4.0.0 0.0.0.255 area 2 Router4(config-router)# end Router4# copy running-config startup-config
Router5
Router5>enable Router5# configure terminal Router5(config)# router ospf 1 Router5(config-router)# router-id 5.5.5.5 Router5(config-router)# network 10.4.0.0 0.0.0.255 area 2 Router5(config-router)# network 10.5.0.0 0.0.0.255 area 3 Router5(config-router)# end Router5# copy running-config startup-config
Router6
Router6>enable Router6# configure terminal Router6(config)# router ospf 1 Router6(config-router)# router-id 6.6.6.6 Router6(config-router)# network 10.5.0.0 0.0.0.255 area 3 Router6(config-router)# end Router6# copy running-config startup-config
After doing this configuration we will see all the network on Topology Table except Area 3. Area 3 is not directly connected to the Backbone Area,Area 0. So in the routing table of the routers there will be no route to this Area 3.
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